Hi,
I think the 5 different audiences reasoning makes sense, but making a micro website for each target will not necessarily match the needs of a given random user to the audience. We can't make an "exclusive OR" out of someone visiting the Tor website.
I think a better approach would be to have the main website (or at least the landing page) targeted at novice users, as this category IMO will be (or should be) the main Tor target. The content can be a basic introduction to Tor and a link to "Getting started" or the Downloads page.
The content for more advance users can still be accessible from the landing page.
The Bitcoin project home page is an example of such an approach.